Calendrier du 20 juin 2022
Roy Seminar (ADRES)
Du 20/06/2022 de 17:00 à 18:15
Salle R2-20, Campus Jourdan 75014 Paris
STEWART Colin (University of Toronto)
Demand in the Dark
A growing body of evidence suggests that consumers are not fully informed about prices, contrary to a critical assumption of classical consumer theory. We analyze a model in which consumer types can vary in both their preferences and their information about prices. Given data on demand and the distribution of prices, we identify the set of possible values of the consumer surplus. Each surplus in this set can be rationalized with simple information structures and preferences. We also show how to narrow down the set of values using richer datasets and provide bounds on counterfactual demands at perfectly observed prices.
Econometrics Seminar
Du 20/06/2022 de 16:00 à 17:15
CREST, 5 Av. Le Chatelier, 91120 Palaiseau
MAUREL Arnaud (Duke University)
Heterogeneity, Uncertainty and Learning: A Semiparametric Identification Analysis
écrit avec Co-authors: J. Bunting and P. Diegert
In this paper, we provide new semiparametric identification results for a general class of learning model in which outcomes of interest depend on i) predictable heterogeneity, ii) initially unpredictable heterogeneity that may be revealed over time, and iii) transitory uncertainty. We consider a common environment where the researcher only has access to longitudinal data on choices and outcomes. We establish point-identification of the outcome equation parameters and the distribution of the three types of unobservables, under the standard assumption that unpredictable heterogeneity and uncertainty are normally distributed. We also show that a pure learning model remains identified without making any distributional assumption. We then derive a sieve MLE estimator for the model parameters, which is shown to exhibit good finite-sample performances and is very tractable in practice.
GSIELM (Graduate Students International Economics and Labor Market) Lunch Seminar
Du 20/06/2022 de 13:00 à 14:00
MSE(106, Blv de l'Hôpital, salle Banquier S03) 75013 Paris
LODI Luca (Macerata University, Paris 1)
Population distribution and export performance: estimates from a structural gravity model.
According to various fields of the economic literature, population distribution and different degrees of urbanization, within and between countries, affect their productivity and specialization. This paper investigates the effect of population density on export performance by adapting a structural gravity framework to include country-specific (mainly geographical) features and distinguishing between trade frictions and productivity fundamentals. The model allows explaining the empirical results that show the heterogeneous impacts of population concentration on trade by sectors and the relative effect of density on international sales with respect to the domestic market.